Threats to Killer Whales

Killer Whales

Killer whales are the largest of the dolphins and have brains four times larger than humans. They are also known as orca whales. While they are powerful predators they have never been known to attack humans in the wild. They eat fish and marine mammals.

These are some of the most known and beloved marine mammals on earth. Now they may be the most contaminated mammals on earth. Because of the high concentration of PCBs in their tissues, the orcas’ immune systems are depressed, their reproductive systems don’t develop and first born calves often die.
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